<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
       //创建 promise 对象;
       const p = new Promise ((resolve, reject)=>{
            //resolve("用户数据");
            reject("失败了");
        })

        //await 要放在async 函数中;
        async function main() {
           try{
               let result = await p ;
               //
               console.log(result);
            } catch (e){
                console.log(e);            
            }
        }
        //调用函数;
        main();
    </script>
</body>
</html>